[Relay] added breaking change.

[LucasYao93]

Description

Checklist

• Check this box to confirm: I have read the Submitting Changes section of CONTRIBUTING.md and reviewed the following information:

• SHOULD select appropriate branch. Cmdlets from Autorest.PowerShell should go to generation branch.
• SHOULD make the title of PR clear and informative, and in the present imperative tense.
• SHOULD update ChangeLog.md file(s) appropriately
  • For any service, the ChangeLog.md file can be found at src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md
  • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header in the past tense. Add changelog in description section if PR goes into generation branch.
  • Should not change ChangeLog.md if no new release is required, such as fixing test case only.
• SHOULD have approved design review for the changes in this repository (Microsoft internal only) with following situations
  • Create new module from scratch
  • Create new resource types which are not easy to conform to Azure PowerShell Design Guidelines
  • Create new resource type which name doesn't use module name as prefix
  • Have design question before implementation
• SHOULD regenerate markdown help files if there is cmdlet API change. Instruction
• SHOULD have proper test coverage for changes in pull request.
• SHOULD NOT introduce breaking changes in Az minor release except preview version.
• SHOULD NOT adjust version of module manually in pull request

[isra-fel]

Breaking changes should have a targeted date. Will it happen in our next breaking change relase this May?

[LucasYao93]

Breaking changes should have a targeted date. Will it happen in our next breaking change release this May?

Hi yeming,
I want to confirm our release steps.

First, we will release module with breaking change.
Second, we will release generate module.

If the steps are correct. Our target date is May.

[BethanyZhou]

Please add a target date or target version in breaking change message.

[LucasYao93]

Done

[BethanyZhou]

The target version should be 2.0.0 for Az.Relay